Patent GB-699451-A (GB)
Title: Improved heating system for regenerative coke ovens or the like
IPC: C10B21/16
Filed: 1949-07-02
Abstract: 699,451. Coke ovens. LITTERSCHEIDT. W. July 2, 1949 [July 2, 1948], No. 17542/49. Class 51(ii) In a regeneratively heated underfired coke oven having a plurality of heating flues in which uniform distribution of the flow of gaseous media in each direction of flow is effected by a plurality of ports on nozzles inserted in the flow path between the regenerators and the heating flue, each port 28 comprises three members 25, 26 and 27 which may be relatively displaced in a plane normal to the gaseous flow to vary the size and/or configuration of the port and which provide a restricted middle region therefor. Equal movement of the members 25 and 27 to the right offers increased resistance to gaseous flow in the upward direction Fig. 2 (not shown) and movement of the member 27 to the left offers increased resistance to gaseous flow in the downward direction. Fig. 3 (not shown), the same width of opening in 'the aforementioned middle region being preserved in each case. The Specification as open to inspection under Sect. 91, comprises the subject matter of Specification 699.505. The Specification as open to inspection under Sect. 91. comprises also other devices ensuring uniform distribution of the flow of gaseous media in 'each direction between bus flues and regenerators and between regenerators and heating flues respectively, and also regulation of gaseous flow to and from the heating flues to compensate for oven taper and for radiation losses at each end by control of port shapes and sizes. In the embodiment shown in Fig. 2 (Cancelled) uniform distribution of gases passing from a bus flue 8 to a regenerator 7 or vice versa is obtained by the use of superposed apertured metallic plates 11 and 12, the plate 11 being displaced by a lever 13 on reversal of the gas flow, whereby the ports 9 which were greatest in size at the outside end of the bus flue for the inflow of air or lean gas have their size gradation reversed for the outflow of waste gases. Changes in the cross-sectional area of the ports 9 as the bus flue 8 cools may be allowed for by varying the materials of which plates 11 and 12 are constructed. In the embodiment shown in Fig. 10 (Cancelled) the ports 6 between a regenerator 7 and a heating flue 2 are so formed that the widening top portion 6‹ favours downward flow, the narrow lower part 6<SP>11</SP> offering more resistance to the upward flow, whereas in Fig. 12 (Cancelled) the position is reversed. These ports are placed at opposite ends of the heating wall and the intermediate ports change gradually from one type to the other. The upper port 6‹ may be replaced by removable inserts which have passages varying between widely conical and cylindrical shape or varying from deep conical to shallow conical across the width of the heating wall. Figs. 17 and 19 (Cancelled) show further modifications in which the cross-sectional area of the narrowest parts of the ports 6 are calculated and graduated to offer the required resistance to gaseous flow from the regenerators to the heating flues, whereas the resistance in the reverse direction depends on the angle of inclination of the upper part of said ports 6, said resistance being greater in the modification shown in Fig. 19 (Cancelled) than in that shown in Fig. 17 (Cancelled). The .upper part of the ports 6 may be formed with conical enlargements in which sit conical plugs having ribs between which the gases pass, the resistances to flow being determined by variations in the top and bottom shape of the plugs. This subject-matter does not appear in the Specification as accepted.